21802838 has 16 divisors (see below), whose sum is σ = 34020000. Its totient is φ = 10467072.

The previous prime is 21802819. The next prime is 21802871. The reversal of 21802838 is 83820812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10598 + ... + 12486.

It is an arithmetic number, because the mean of its divisors is an integer number (2126250).

Almost surely, 2^21802838 is an apocalyptic number.

21802838 is a deficient number, since it is larger than the sum of its proper divisors (12217162).

21802838 is a wasteful number, since it uses less digits than its factorization.

21802838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 21802838 is about 4669.3509184896. The cubic root of 21802838 is about 279.3643659484.

The spelling of 21802838 in words is "twenty-one million, eight hundred two thousand, eight hundred thirty-eight".